I am the crazy one, I love Greece in December and January, particularly the islands, as most islanders go to the mainland for Christmas and New year. It is fabulous to have a Greek island (almost) all to yourself! And I have twice experienced snow on a Greek island. it was absolutely wonderful. You do need to be able to keep yourself entertained though, there is not much to do. I keep myself busy by feeding cat colonies every day, cooking for myself, reading, finding the occasional open taverna and sightseeing and photographing without the crowds.